Caster



FIG. 1 is a perspective view of the front, left and top plan of the invention.

FIG. 2 is a top plan view of the design according to the invention.

FIG. 3 is a front view of the design according to the invention.

FIG. 4 is a left side view of the design according to the invention.

FIG. 5 is a right side view of the design according to the invention.

FIG. 6 is a rear view of the design according to the invention; and,

FIG. 7 is a bottom view of the design according to the invention.

The elements shown in broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a caster, as shown and described. 